October 21 - CHICAGO - Weather History and Averages

Station: CHICAGO (2005 to 2025)
Country: US
State: IL
Latitude: 42.0
Longitude: -87.5

High Temperatures

On October 21 in CHICAGO the average high temperature is 63.0 °F (17.2 °C). The lowest recored high temperature was 50.5 °F (10.3 °C) in 2011 and the highest recored high temperature was 81.7 °F (27.6 °C) in 2024. The high temperature is usually^* between 56.8 °F (13.8 °C) and 69.1 °F (20.6 °C). About a quarter of the time, the high temperature is less than 56.8 °F (13.8 °C), and another quarter of the time, the high temperature is greater than and 69.1 °F (20.6 °C). About 95% of the time, the high temperature has been between 45.2 °F (7.3 °C) and 80.7 °F (27.1 °C).

Low Temperatures

On October 21 in CHICAGO the average low temperature is 50.0 °F (10.0 °C). The lowest recored low temperature was 40.8 °F (4.9 °C) in 2011 and the lowest recored low temperature was 62.8 °F (17.1 °C) in 2007. The low temperature is usually^* between 45.6 °F (7.6 °C) and 54.3 °F (12.4 °C). About a quarter of the time, the low temperature is less than 45.6 °F (7.6 °C), and another quarter of the time, the low temperature is greater than and 54.3 °F (12.4 °C). About 95% of the time, the low temperature has been between 37.4 °F (3.0 °C) and 62.5 °F (17.0 °C).

Frost

On October 21 in CHICAGO expect the temperatures to drop below freezing for a risk of frost about 0.3% of the time.

^{Usually* in this context means around 50% of the
time, assuming a normal distribution of values.}

Data Source(s)

The data used to compute the average high/low temperatures for this location were taken from the following stations:

CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 — from year 2005 to 2024

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